Guard for woodworking-machines.



T. w. DOOLITTLE. GUARD FOR WOODWORKING MACHINES.

TIQN ElLED NOV.?., 1914.

1,154,911. PatentedSept. 28, 1915.

iiiiiiniiimumj I m Milan TRACY :ooomrrtnjor nnnioo'rr, NEW YORK,ASSIGNOR 'ro WILLIAM or. Donner,

a 1 for BINGHAJVITON, NEW YORK- p GUARD FOR WOODWORKING-MAGHINES.

risaeii. f

a citizen of the United States,residing at Endicott, in the county ofBroome and State of New York, havelinvented certain new and usefulImprovements in Guards machines'and particularly use may readily forW0odworking-Machines,.of which the followingis a specification,

' This invention relates to woodworking to sawmills and wood finishingmachines. In theoperation of these machines it frequently occurs thatpieces of material operated upon are thrown violently from the machineoperation of the saws, cutters or other tools which rotate at a veryhigh rate of speed, with the result that persons near the ma chine aresometimes killed and frequently are seriously injured. k

The object which I have in viewisto provide a simple, cheap easilyoperated device whereby the throwing out, of a piece ofmaterial beingworked upon, after being properly introduced in a machineemay beprevented.

ir further objectjis to providea device of the character referred towhich is capable of being moved rapidly, into and out of operativeposition, and which is so formed and has the parts so arranged that itwill adjust itself automatically for operation upon material ofdifferent thicknesses introduced at the same time into a machine. Afurther object of the invention isto provideja safety device of the kindreferred to whereinthe operative parts, upon which most of the work andstrain isimposed in be removed separately and replaced at small costwhen worn or broken.

l/Vith'theseobjects in view the invention consists of the guard formachines of'the kind referred to having the novel generic and specificfeatures of construction and Earrangement of the parts substantially ashereinafter described andvclaimed.

In the drawing, Figure 1 is a side view partly in section-of a portionof a: planing machine with the guard in positionthere on; and, Fig. 2 isa side view of one of the dogs forming part of the device, the dog beingshown in operative position by full lines and by dotted lines in theposition assumed when out of operative position, the

shaft and bar employed being shown in section.

- Specification of Letters Patent.

by reason of the "duced into the machine are" in this position they bearPatented Sept. as, was.

v Application filed November 2, 1914. Serial No. 869,723.

ln the drawing the guardor safety de- VlCQ is for purposes ofillustration shown as appl ed to a planing machine though as XVlll bGapparent from an understanding of the invention it may with equalfacility be applied to saw mills and various other woodworking machines.

,In the drawing 1 represents a portion of the frame ofa planing machine,and 2 represents a feed roller. rrrranged beneath the roller is a worktable 3 which is vertically adjustable in any suitable way as is usualin machines of the V character referred to. Arranged in front" of thefeed roller 2 area series of freely swinging dogs 6 each having thereinan opening 7 which receives a shaft 8 suitably fixed to the sides of theframe on the inner faces thereof. Extending across the machine in frontof and, a short distance above the shaft 8 is a bar 10, against whichportions of the dogs 6 bear when the dogs are out of operative positionand by which the dogs are prevented from being moved out of operativeposition'when the dogs arein place for use. The bar is preferably seatedin sockets in the plates 9, and retained by set screws 11. The dogsemployed are each composed of a main, substantiall circular body'12 andeach has integrally formed with it a pointed preferably curvedprojection 13 having a curved forward face 14. Located above theprojection 18 is a protuberance 15. forming a weight, theaction of'whichis to maintain the projectionll in a downward or operative position whenthe dogs are intended for use or to retain them in place when put-inpositions outof use Arranged on the faces of the dogs opposite to theseon which the protuberances 15 are located are lips 16 each having anupper plane surface. a In the use of the device the dogs are movedto aposition out of operation, as shown by dotted lines in Fig. 2 when thework to be operated upon is being intro- WVhenthe dogs I upon the upperface of the bar 10, and this bar is such a distance in rear of the shaft8, that when the dogs rest upon it, the weights 15 of the dogs are backof the vertical axis of the shaft 8. Thus the weights serve to retainthe dogs out of operative position and to prevent their accidentaldisplacement. Be- 110 terial to be operated upon.

- introduced.

y when the, feed; roller fore thebeginning of the operation of thmachine the dogs are turned down bringing them into the positions shownfull lines in Fig. 2 of the drawing, bringing the ends ofthe projections13 to bear upon the ma i' The arrange ment of the shaft 8 with respectto the'feed roller 2 is suclr that I when the dogs are turned down topositions for use the ends of the projections 13 bear upon the materialtobeoperated upon a short distance for ward of the vertical axis of theshaft 8,

bears on such material.

When the parts are 1n this position the free forward movement of thematerial is permitted, but any rearward movement thereof is instantlychecked by the; action of the dogs. The dogs are prevented from beingput out of operation by the sinking of the projections 13 into thematerial and the turning of the dogs on the shaft 8 by con tact of thelips 16 of the dogs with the lower face of th-e'bar 10. Should the dogsbe turned to bring the projectionslB thereof downward when no materialis in the machine, the contact of the dogs with the bar maintains thedogs in such position that no obstruction to the introduction ofmaterial to be operated upon is offered, the ends of the projectionsbeing held a short distance forward of the shaft 8 and being thus inposition to be readily swung forward by contact with the upper face ofthe work As each dog employed is capable of independent swinging on theshaft, it will be clear that the guard will be equally effective whenseveral pieces of wood of different thicknesses to be operated upon areintroduced into the machineto which the guard is applied as when one ormore pieces of the same thickness are introduced.

hen in the operation of the guard, a force is exerted by a saw or othertool to throw a piece of wood rearward from the machine, no considerableinjury will, under ordinary circumstances, be done to its surface, forthe reason that the front curved faces of the projections of the dogswill be brought into contact with the wood and its movement will bechecked by w-edging of the wood between such curved faces and the table55. faces is such that little or no penetration of the wood takes'place.

Ionics of, this) patent may, be, obtained, for,

The breadth of the curved The described construction permits of theready application of the device to, machines of varying widths by theutilization of longer or shorter shafts and bars and of a greater orless number-of dogs, and the substitution of a new dog for a worn orbroken one may beraccomplished easily and at small cost. 0 i

I claim: Y i

r 1. A guard of the kind described comprising a pluralityoffreely-swinging dogs, a

shaft onwhich the dogs are mounted, means for mounting the shaft above afeedway or table, anda*bar arranged adjacent to such shaft in the pathof the swinging move-' nients of the dogs to limit their movement in onedirection to/normally operative substantially vertical positions, andto. limit the movementofthe dogs and to support them when swung in theopposite direction.

A guard of the kind described comprising a plurality of freely swingingdogs, each dog being provided on its rear face adjacent to the'engagingsurface of the dog, with a protuberance constituting a weight, a shafton which the dogs are mounted, means for mounting the shaft above afeedway or table, and a bar arranged forward of such shaft in the pathof the swinging movements of the dogs to limit their movements inonedirection to normally operative substantially vertical positions, andto 7 limit the movement of the dogs and support them when swung in theopposite direction.

3'. A guard of the kind described comprising a plurality of freelyswinging dogs, each dog being provided on its rearside with acurvedbearing surface and with a protuberance constituting a weight, ashaft on which the dogs are mounted, means for mounting the shaft abovea feedway or table, and a bar arranged for-ward and above such shaft inthe path of the swinging movements of the dogs tolim-it their move.-ments in one direction to normally substantially vertical positions andto limit the movement andsupport the dogs when swung in the oppositedirection.

' In" testimony whereof I afiix my signature in presence'oftwowitnesses" TRACY W; DOOLETTLE Witnesses? v Ftonmvcn N. Cnawronn, Lnwrs-S CLARIQL five cents each, :by addressing the. Gommissmnen 0!: Patents Wh n n, B4 S3"

